I'm attempting to help a relative figure the cost basis of Chevron shares bought over a number of years. The relative has kept a cost basis tally up until a 2 for 1 split in 2004.

As has already been mentioned, just divide the previous per share basis by 2.

Unless the relative has sold everything, you're going to need to do this by block, not in the aggregate. I find the easiest way is to just write on the purchase confirmation "mm/dd/2004 2/1 split," the new number of shares in that block, and the new per-share basis for that block.

Announcements

When Life Gives You Lemons
We all have had hardships and made poor decisions. The important thing is how we respond and grow. Read the story of a Fool who started from nothing, and looks to gain everything.

Work for Fools?
Winner of the Washingtonian great places to work, and Glassdoor #1 Company to Work For 2015! Have access to all of TMF's online and email products for FREE, and be paid for your contributions to TMF! Click the link and start your Fool career.